US4423499A - Pickup adjusting equipment - Google Patents

Pickup adjusting equipment Download PDF

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Publication number
US4423499A
US4423499A US06/291,121 US29112181A US4423499A US 4423499 A US4423499 A US 4423499A US 29112181 A US29112181 A US 29112181A US 4423499 A US4423499 A US 4423499A
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US
United States
Prior art keywords
surface part
plain surface
stylus
pickup
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/291,121
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English (en)
Inventor
Karl Peschel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AKG Acoustics GmbH
Original Assignee
AKG Akustische und Kino Geraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AKG Akustische und Kino Geraete GmbH filed Critical AKG Akustische und Kino Geraete GmbH
Assigned to AKG AKUSTISCHE U. KINO-GERATE, GESELLSCHAFT M.B.H., BRUNHILDENGASSE, 1, A-1150 WIEN, AUSTRIA reassignment AKG AKUSTISCHE U. KINO-GERATE, GESELLSCHAFT M.B.H., BRUNHILDENGASSE, 1, A-1150 WIEN, AUSTRIA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PESCHEL, KARL
Application granted granted Critical
Publication of US4423499A publication Critical patent/US4423499A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/56—Gauges for measuring angles or tapers, e.g. conical calipers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/06—Determining or indicating positions of head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/12—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse

Definitions

  • the invention relates in general, to phonograph pickups and pickup arms and more particularly to an auxiliary device for precision adjusting phonograph pickups and pickup arms, wherein the auxiliary device is designed for placement on the turntable.
  • the correct mounting and adjustment of the pickup and pickup arm has fundamental importance for optimizing the function of today's high quality pickups, and for as sparing a tracking of record as possible.
  • the purchaser himself may wish to mount and adjust the pickup, even though he frequently is not skilled in this regard and does not have the proper means for adjustment.
  • the problem is complicated by the fact that certain necessary adjustments affect others and must, therefore, alternately be repeated.
  • the overhang is adjusted in order to optimize the error angle during movement of the pickup arm across the record.
  • An error angle results from the fact that the grinding axis of the stylus exactly coincides with the groove tangent only at two points of the record surface. In practice, this means that if the pickup arm is moved up to record center, the stylus is not aligned with the record center but projects or "overhangs" slightly beyond. The distance between the record center and the stylus depends among others on the shape and length of the pickup arm. Any incorrectly adjusted overhang increases distortions resulting from the error angle which can never be eliminated with conventional pickup arms.
  • templates are employed indicating the position of the pickup at a predetermined angle of the arm.
  • This adjustment is frequently neglected. In fact however, this position affects the cross-talk attentuation between the two sound channels of the stereo record and, particularly, the wear of the record if a specially ground stylus is used. It is a common practice to check this normal position by placing a flat mirror on the turntable and observing whether the edges of the pickup housing align with their mirror images. If not, the sound head support must be turned in the pickup arm. Difficulties arise with this method in instances where due to its shape, the pickup cannot show a clear mirror image alignment, or if the thickness of the mirror does not exactly correspond to that of the record.
  • Some pickup arms have a vertically adjustable fulcrum. This makes allowance for different heights of the pickup. Since the superelevation between the arm fulcrum and the stylus point affects the track angle, an exactly horizontal position of the arm is needed to eliminate distortions. Up to the present time, this has been done merely by optically checking the constant spacing between the pickup arm tube and the record surface.
  • the cutting stylus While cutting a record, the cutting stylus is inclined by 15° to 20° against the running direction of the cut matrix. To minimize distortions or intermodulation during the production of the record, the pickup stylus also is held in this angular position. Since the commercially available pickups may vary in size, the actual vertical track angle should also be checked, in addition to the checking of the horizontal position mentioned under 3 above, which however, cannot be done by the user without employing special instruments.
  • the invention is directed to a simple device which is easy to manufacture and handle and which unites all the checking functions necessary for mounting and mutually adjusting the pickup and the pickup arm in the most proper way.
  • an auxiliary device comprising two plane-surface parts, preferably separable from each other, which are assembled to form legs of an L-shape and which are provided with orienting elements in the form of line gratings or measuring devices with scales, or both, with respective definite contact points for the stylus being provided on the longer L leg of the L-shaped device.
  • the invention has the advantage that all the auxiliary means needed for an adjustment are united into a single piece of equipment, so that a simplification is obtained and errors are eliminated which might occur due to the use of individual adjusting elements. Also, no misplacement or loss of one or the other part is possible. Further, the handling of the inventive auxiliary device is simple and logical thereby making it possible even for an unskilled person to optimally adjust a pickup and the supporting arm thereof. Nevertheless, the invention may advantageously be applied in industrial applications and contributes to a cost reduction in the assembly of record players.
  • the essential part of the auxiliary device is the orienting elements which are provided as line gratings and sighting means on the two legs.
  • the inventive auxiliary device may also be employed as a balance for determining the downward pressure of the stylus. As compared to prior art devices of this kind, the inventive device is extremely simple and robust, without being inaccurate.
  • a device for adjusting a pickup carrying a stylus and a pickup arm of a record player of the type adapted to be received on the turntable which includes a structure having a first plane surface part and a second plane surface part so connected to said first plane surface part to form an L-shaped structure, a contact point on the longer of the first and second plane surface parts for receiving the stylus, and orienting means on the structure for comparing the position of the pickup and pickup arm relative thereto when the stylus is received on the contact point.
  • FIG. 1 is a diagrammatical perspective view of the inventive device
  • FIGS. 2a, 2b and 2c show different embodiments of a detail of the device for balancing
  • FIG. 3 is a front view of the shorter leg of the device.
  • the inventive auxiliary device 30 substantially comprises two legs or plates 1, 2 which are assembled to form an L-shaped structure.
  • the device might be in a single piece, however, separable plates 1, 2 are advantageous, for example, for space saving storage.
  • Plate 2 must have exactly the same thickness as a phonograph record.
  • At least plate 1, moreover, must be made of a transparent material.
  • the Two parts 1 and 2 extend perpendicularly to each other and form an L in cross section.
  • a line grating 4 is provided which is associated with a contact point 5 for the stylus 18 of a pickup 17 (FIG. 3).
  • the auxiliary device 30 is placed on the turntable in a position in which a recess 6 embraces the turntable spindle.
  • the pickup, or the pickup arm in constructions with a displaceable arm, is displaced until the edges of the pickup or pickup arm are aligned with the line grating 4.
  • a mirror 20 serves to bring the stylus into the correct vertical position.
  • the mirror may be adhered to the device or produced in any other advantageous manner. In this way adjustment number 2 which was set forth above, can be made.
  • a more accurate method consists in placing the auxiliary device on the turntable so that the leg 2 extends in the direction of the pickup arm and toward its fulcrum while leg 1 extends directly in front of the front edge of the pickup and parallel thereto, and using a line grating 3 of leg 1 as a sighting means. That is, the device 30 is placed with the right-hand edges of legs 1 and 2 as seen in FIG. 1, down on the turntable. By looking through leg 1, in the direction of the front side of the pickup, any angular misalignment of the pickup may easily be detected by means of line grating 3.
  • Lines 7 serve for checking the horizontal position (adjustment member 3 above) of the tonearm tube.
  • the auxiliary device 30 is again turned through a ninety degree angle (about the long axis of leg 2) and placed upright on the turntable, so that lines 7 serve as a sighting means for the arm tube.
  • Leg 2 includes a wedge-shaped element 11 which forms the part of the device intended for checking the vertical tracking angle.
  • the pickup axis and leg 1 are brought into a position in which they are parallel to each other and the stylus rests against contact point 12.
  • the position of stylus holder 19 can be checked by means of the incline of element 11 through a magnifying glass 10, which is built into leg 1. If the inclinations correspond to each other, the correct tracking angle may be inferred therefrom indirectly, since stylus 18 (FIG. 3) is mostly secured to stylus holder 19 in perpendicular position. It is also possible to select an angle of incline 11 corresponding to another specific edge of the housing, having a definite geometric relation to the stylus direction. In this way adjustment number 4 above can be made.
  • a graduation 9 makes it possible to determine the stylus force of downward pressure of the stylus by means of the inventive auxiliary device 30, while using leg 2 as a balance beam.
  • the fulcrum permitting such a motion of leg 2 may be formed by a leaf spring 21 secured to each longitudinal side of leg 2 and simply buckled downwardly as soon as the balancing function is needed. (FIG. 2a)
  • the longer leg 2 may be provided with laterally separated triangular notches 24 which are engageable with knife-edge supports 23 provided on the shorter leg 1.
  • the two legs 1,2 must be detachable from each other.
  • the center of gravity of a balance is situated below the fulcrum, to obtain a static equilibrium. This prerequisite is not satisfied in the variants of FIG. 2a and 2b. In these instances, it is advisable to displace the stylus resting against graduation 9 until leg 2 tilts from one inclined position into the other.
  • the inventive auxiliary equipment may even be provided in addition with further means, such as with two retaining pins 14 fitting in the mounting holes of the pickup arm and usable for fixing the arm, to facilitate the engagement of the contact shoes. Holes 15 of corresponding diameter for receiving the heads of cylindrical screws needed for mounting the pickup serve the purpose of fixing the heads while having both hands free for the assemblage.
  • a plastic mass for cleaning the stylus may be received in a corresponding recess 16. That is, experience has shown that it is advantageous to clean strongly fouled styluses by pressing them lightly into a permanently elastic material whereby even dirt firmly adhering to the stylus is securely removed.
  • the equipment It is also simple to provide the equipment with a stroboscope 13 or stroboscopic marks for checking the speed of the record.
  • the marks may be printed or formed by molding, preferably on the underside of part 2.
  • the inventive device 30 is designed to check pickups only, checking for the overhang makes no sense, since the overhang depends on the design of the pickup arm. It may also be provided to design the measuring equipment as a part of a pickup packaging, for example, with leg 1 forming the bottom and leg 2 a side wall of a rectangular box.
  • an auxiliary device for adjusting the pickup and pickup arm of a record player as exactly as possible which is designed to be placed on the turntable, characterized in that the equipment comprises two plane-surface parts 1,2 preferably separable from each other, which are assembled to form an L-shaped structure and which are provided with at least orienting elements in the form of line gratings 3,4,7 or measuring devices 11, or both, and graduations 9, with respective definite contact points 5,9,12 for the stylus 18 being provided on the longer leg 2 of the L-shaped auxiliary device.
  • the device is characterized by the feature that one of the orienting elements comprises a grating of crossing parallel lines 7 which are associated with a contact point 5 for the stylus and that this arrangement is provided on the longer leg 2 having a recess 6 for engaging over or resting against the pivot pin of the turntable.
  • the invention is characterized by the feature that the measuring device is designed as a balancing device with a graduation 9 indicating the downward pressure of the stylus 18.
  • the balance beam of the balancing device is peferably formed by the longer leg 2 of the L-shaped auxiliary equipment, which may be provided with insertable contact elements 22 or with a leaf spring 21 mounted for buckling downwardly.
  • the longer leg 2, serving as the balance beam, is provided on each of two opposite locations of its longitudinal sides with a triangular notch 24 into which two knife-edges 23 provided on the shorter leg 1 are engageable.
  • the larger leg 2 is provided with a preferably wedge-shaped element 11 located at least approximately near the focal point of a magnifying glass 10 which is mounted in the shorter leg 1, and that this arrangement is associated with a definite contact point 12 for the stylus 18, provided on the longer leg 2.
  • the device is preferably even still further characterized by the feature that one of the orienting elements comprises a number of parallel lines 7 extending on the longer leg 2 parallel to the longitidunal axis thereof.
  • the shorter leg 1 is preferably made of a transparent material and is provided with a line grating 3 of perpendicularly crossing lines which extend parallel to the sides of the rectangle formed by the shorter leg 1.
  • the longer leg 2 is preferably provided with a mirror 20 and the mirror is formed by vapor deposition on the surface of the longer leg 2.
  • the equipment is preferably designed as a part of a pickup packing.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Optical Head (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
US06/291,121 1980-08-11 1981-08-07 Pickup adjusting equipment Expired - Fee Related US4423499A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0411880A AT371261B (de) 1980-08-11 1980-08-11 Einstellvorrichtung bei plattenspielern
AT4118/80 1980-08-11

Publications (1)

Publication Number Publication Date
US4423499A true US4423499A (en) 1983-12-27

Family

ID=3559891

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/291,121 Expired - Fee Related US4423499A (en) 1980-08-11 1981-08-07 Pickup adjusting equipment

Country Status (7)

Country Link
US (1) US4423499A (de)
JP (1) JPS5755501A (de)
AT (1) AT371261B (de)
DE (1) DE3130752A1 (de)
DK (1) DK354381A (de)
ES (1) ES504667A0 (de)
GB (1) GB2082369B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490816A (en) * 1982-09-27 1984-12-25 Shure Brothers, Inc. Tonearm alignment gauge
US4686664A (en) * 1981-07-29 1987-08-11 Robert Graham Tone arm assembly
US4841397A (en) * 1985-04-04 1989-06-20 Canon Kabushiki Kaisha Head shifting device
CN106338227A (zh) * 2016-09-08 2017-01-18 鹤山联塑实业发展有限公司 海洋养殖网箱条形脚踏板外形尺寸检测工具及检测方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1083558B (de) * 1958-06-16 1960-06-15 Steidinger Geb Einrichtung zum Bestimmen des Tonarm-Auflagegewichts
US3283411A (en) * 1964-08-27 1966-11-08 Alan A Steward Tracking error measuring device
US3686939A (en) * 1970-12-17 1972-08-29 Shure Bros Stylus tracking force gauge
GB2054239A (en) * 1979-07-05 1981-02-11 Townshend J M Tonearm tracking error measurement
US4295277A (en) * 1979-09-26 1981-10-20 Dennesen Electronics Inc. Stylus positioner
US4326283A (en) * 1980-09-02 1982-04-20 Quality Audio Components, Inc. Cartridge alignment system
US4368527A (en) * 1979-11-23 1983-01-11 Goldstein Michael J Phonograph cartridge alignment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1083558B (de) * 1958-06-16 1960-06-15 Steidinger Geb Einrichtung zum Bestimmen des Tonarm-Auflagegewichts
US3283411A (en) * 1964-08-27 1966-11-08 Alan A Steward Tracking error measuring device
US3686939A (en) * 1970-12-17 1972-08-29 Shure Bros Stylus tracking force gauge
GB2054239A (en) * 1979-07-05 1981-02-11 Townshend J M Tonearm tracking error measurement
US4351045A (en) * 1979-07-05 1982-09-21 Townshend James M Tracking error measurement
US4295277A (en) * 1979-09-26 1981-10-20 Dennesen Electronics Inc. Stylus positioner
US4368527A (en) * 1979-11-23 1983-01-11 Goldstein Michael J Phonograph cartridge alignment
US4326283A (en) * 1980-09-02 1982-04-20 Quality Audio Components, Inc. Cartridge alignment system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4686664A (en) * 1981-07-29 1987-08-11 Robert Graham Tone arm assembly
US4490816A (en) * 1982-09-27 1984-12-25 Shure Brothers, Inc. Tonearm alignment gauge
US4841397A (en) * 1985-04-04 1989-06-20 Canon Kabushiki Kaisha Head shifting device
CN106338227A (zh) * 2016-09-08 2017-01-18 鹤山联塑实业发展有限公司 海洋养殖网箱条形脚踏板外形尺寸检测工具及检测方法

Also Published As

Publication number Publication date
ES8204870A1 (es) 1982-05-16
GB2082369B (en) 1985-04-11
ATA411880A (de) 1982-10-15
JPS5755501A (en) 1982-04-02
DE3130752A1 (de) 1982-04-29
GB2082369A (en) 1982-03-03
AT371261B (de) 1983-06-10
DK354381A (da) 1982-02-12
ES504667A0 (es) 1982-05-16

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AKG AKUSTISCHE U. KINO-GERATE, GESELLSCHAFT M.B.H.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PESCHEL, KARL;REEL/FRAME:003909/0541

Effective date: 19810717

Owner name: AKG AKUSTISCHE U. KINO-GERATE, GESELLSCHAFT M.B.H.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PESCHEL, KARL;REEL/FRAME:003909/0541

Effective date: 19810717

CC Certificate of correction
FEPP Fee payment procedure

Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 19871227